# SisUM vs Elgin Pro

The clearest difference is update cadence: SisUM at fortnightly against Elgin Pro's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

SisUM ships an update fortnightly, Elgin Pro every 5 weeks. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SisUM | Elgin Pro |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | — | Free |
| Size | 166 MB | 43 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Guido Garcia](https://appshunter.io/developer/1534036551) | [Elgin](https://appshunter.io/developer/1220234539) |

## What reviewers say

### SisUM

[App page](https://appshunter.io/ios/app/sisum/id1534036549)

**Features:** macOS Compatibility

**In-app purchases:** none


### Elgin Pro

[App page](https://appshunter.io/ios/app/elgin-pro/id6447068619)

This app provides essential tools and resources for air conditioning technicians and installers. It offers offline functionality, technical calculators, educational content, and product information to streamline daily tasks and improve customer support.

**Highlights:** Offline technical tools, Thermal capacity calculator, Superheat calculator, Fluid x temperature converter, Educational content and tutorials, Product portfolio and specifications, Error code lookup

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SisUM free?

SisUM is free to download, with no in-app purchases.

### Is Elgin Pro free?

Elgin Pro is free to download, with no in-app purchases.

### Do SisUM or Elgin Pro have ads?

Neither SisUM nor Elgin Pro shows ads.

### Which is updated more often, SisUM or Elgin Pro?

SisUM ships an update fortnightly, and Elgin Pro every 5 weeks. Most recently, SisUM was updated on October 3, 2026 and Elgin Pro on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*